Question 437Motor Plants - Assistant Engineer

The correct answer is D) bleed off all hydraulic pressure from the system. Before servicing or repairing an auxiliary diesel engine hydraulic starting system, it is crucial to bleed off all hydraulic pressure to prevent sudden and dangerous release of pressurized fluid or components. Releasing the pressure ensures the system is in a safe, depressurized state, reducing the risk of injury or further damage during the maintenance work. The other options, while potentially useful, do not directly address the need to depressurize the system prior to service.